Low-temperature electrochemical characterization of dense ultra-thin lanthanum strontium cobalt ferrite (La0.6Sr0.4Co0.8Fe0.2O3) cathodes synthesized by RF-sputtering on nanoporous alumina-supported Y-doped zirconia membranes

Hui Xiong, Bo Kuai Lai, Alex C. Johnson, Shriram Ramanathan

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Dense ultra-thin nanocrystalline La0.6Sr0.4Co0.8Fe0.2O3 (LSCF) films with thickness of ∼50 nm, have been sputtered on nanoporous anodic alumina-supported nanocrystalline thin film yttria-stabilized zirconia and patterned by photolithography into microelectrodes. This approach enables low-temperature (425-550 °C) electrochemical properties of dense ultra-thin nanocrystalline LSCF to be characterized. The results reveal that the electrochemical resistance of nanocrystalline ultra-thin LSCF is dominated by the oxygen surface exchange reaction at the electrode surface with an activation energy of 1.1 eV. Area-specific resistance of LSCF was obtained and the results are of potential relevance to utilizing nanostructured oxide cathodes for micro-SOFCs operated at low temperatures.

Original languageEnglish
Pages (from-to)589-592
Number of pages4
JournalJournal of Power Sources
Volume193
Issue number2
DOIs
StatePublished - 5 Sep 2009

Keywords

  • Area-specific resistances
  • Cathode
  • Lanthanum stronium cobalt ferrite
  • Microelectrode
  • Nanocrystalline
  • Solid oxide fuel cell
  • Ultra-thin films

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